WO2010137218A1 - Rear sheet entertainment system - Google Patents

Rear sheet entertainment system Download PDF

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Publication number
WO2010137218A1
WO2010137218A1 PCT/JP2010/001787 JP2010001787W WO2010137218A1 WO 2010137218 A1 WO2010137218 A1 WO 2010137218A1 JP 2010001787 W JP2010001787 W JP 2010001787W WO 2010137218 A1 WO2010137218 A1 WO 2010137218A1
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WO
WIPO (PCT)
Prior art keywords
sound
unit
entertainment system
speaker unit
rear seat
Prior art date
Application number
PCT/JP2010/001787
Other languages
French (fr)
Japanese (ja)
Inventor
松田茂信
山本剛史
Original Assignee
三菱電機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2009-126613 priority Critical
Priority to JP2009126613 priority
Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Publication of WO2010137218A1 publication Critical patent/WO2010137218A1/en

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • B60R11/0229Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for displays, e.g. cathodic tubes
    • B60R11/0235Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for displays, e.g. cathodic tubes of flat type, e.g. LCD
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00Arrangements for holding or mounting articles, not otherwise provided for
    • B60R11/02Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof
    • B60R11/0217Arrangements for holding or mounting articles, not otherwise provided for for radio sets, television sets, telephones, or the like; Arrangement of controls thereof for loud-speakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/02Casings; Cabinets ; Supports therefor; Mountings therein
    • H04R1/028Casings; Cabinets ; Supports therefor; Mountings therein associated with devices performing functions other than acoustics, e.g. electric candles
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/20Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/32Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only
    • H04R1/34Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means
    • H04R1/345Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by using a single transducer with sound reflecting, diffracting, directing or guiding means for loudspeakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R5/00Stereophonic arrangements
    • H04R5/02Spatial or constructional arrangements of loudspeakers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00Arrangements for holding or mounting articles, not otherwise provided for
    • B60R2011/0001Arrangements for holding or mounting articles, not otherwise provided for characterised by position
    • B60R2011/0003Arrangements for holding or mounting articles, not otherwise provided for characterised by position inside the vehicle
    • B60R2011/0028Ceiling, e.g. roof rails
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60RVEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R11/00Arrangements for holding or mounting articles, not otherwise provided for
    • B60R2011/0042Arrangements for holding or mounting articles, not otherwise provided for characterised by mounting means
    • B60R2011/008Adjustable or movable supports
    • B60R2011/0085Adjustable or movable supports with adjustment by rotation in their operational position
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2499/00Aspects covered by H04R or H04S not otherwise provided for in their subgroups
    • H04R2499/10General applications
    • H04R2499/13Acoustic transducers and sound field adaptation in vehicles
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones
    • H04R3/04Circuits for transducers, loudspeakers or microphones for correcting frequency response

Abstract

A rear sheet entertainment system (RSE) is configured by a display unit (LCD monitor 2) which is mounted so as to be openable and closable about a hinge (20), a sound conduit-type speaker unit (5 (5a, 5b)) which is mounted in a position that does not obstruct the opening and closing of the display unit and comprises a slit-shaped opening (3 (3a, 3b)) for listeners, and a control device (RSE main body (1)) which includes a calculation processing unit (23) for correcting the phase characteristics and sound pressure frequency characteristics of the sound conduit-type speaker unit by an inverse compensation filter, the filter coefficient of the inverse compensation filter being set on the basis of the previously measured acoustic characteristics of the sound conduit-type speaker unit.

Description

Rear-seat entertainment system

The present invention, in a speaker integral attached to the vehicle interior ceiling relates rear seat entertainment system.

Vehicle information system, as vehicle interior occupant spend comfortable can be handled entertaining high various video, audio, and the video, AV reproducing the audio (Audio Visual) car equipment it is becoming common to plural installed indoors.

For example, in a vehicle with three rows of seats of relatively large, two rows, for a rear seat of the third row, it is often installed rear monitor ceiling mounting type which is mounted via a bracket to the vehicle compartment ceiling. Accordingly, rear seat entertainment system allowing the control of the sound source to be reproduced by the rear seat from the front seat (hereinafter, simply referred to as RSE) in the head unit in the front seat, with a rear control unit to the rear seat, in the rear seat, can listen freely by the rear monitor seats with different content of the ceiling-mounted via the front rear control unit. However, the listening of the sound source, either by wireless headphones, or by vehicle speaker which is driven in conjunction with the head unit was almost.

Therefore, conventionally, the rear monitor speaker integrated are known, so that it is possible to enjoy a different content in the front seat and rear seat freely (for example, see Patent Document 1).
On the other hand, conventionally, in the field of television, sound signals emitted from the opening of the sound guiding tube of the sound guiding tube type speaker unit, in order not to deteriorate the characteristic possessed by the speaker himself under the influence of the sound guiding tube, the sound tube performs audio signal processing using a non-recursive digital filter for realizing inverse characteristic of the transfer characteristic (hereinafter, referred to as linear phase correction technique) sound reproduction apparatus is known (e.g., see Patent Document 2).

JP 2006-248253 JP Patent No. 3167259 Publication

In conventional RSE described above, because it was listening to the sound source using a wireless headphones, it is necessary to accessory wireless headphones RSE, had become relatively expensive system. In addition, small children there is also a problem that can not be installed not match the size of the wireless headphones.
Also, as in the technique disclosed in Patent Document 1, if a built-in speaker RSE, the RSE size constraints, can not implement a large speaker diameter, Thus, there is a problem in terms of bass reproduction It was. In addition, it can not implement a round speaker from restrictions on the RSE of design, because there is if you want to implement the ellipse speaker was almost, distorted sound quality had deteriorated occurred in the sound. Therefore, it is desirable to apply the linear phase correction technique disclosed in Patent Document 2 corrects the sound quality.

The present invention has been made to solve the problems described above, without impairing the compactness sense of RSE by using linear phase correction technique, to provide a rear seat entertainment system that can avoid degradation of sound quality the interest.

Rear seat entertainment system of the present invention to solve the problems described above, a display unit which is openably mounted to the shaft of the hinge is mounted on unobtrusive position in the opening and closing of the display unit toward the listener slit a sound guide tube type speaker unit having a Jo openings, the filter coefficients of the inverse correction filter based on the acoustic characteristics of the sound conduit type speaker unit which is measured in advance is set, the sound conduit speaker unit by the inverse correction filter those having the a control device including an arithmetic processing unit for correcting the phase characteristic and the sound pressure frequency characteristics.

According to the present invention, by using the linear phase correction technique, to avoid degradation of sound quality without impairing the compact sense of RSE, it is possible to provide a rear seat entertainment system.

Is a perspective view showing an external structure of a rear seat entertainment system according to the first embodiment of the present invention. It is a cross-sectional view of a rear seat entertainment system according to the first embodiment of the present invention. It is a front view seen from the back seat of the rear seat entertainment system according to the first embodiment of the present invention. Is a block diagram showing an internal configuration of an electric system of the rear seat entertainment system according to the first embodiment of the present invention. It is a cross-sectional view of a rear seat entertainment system according to the second embodiment of the present invention. It is a front view seen from the back seat of the rear seat entertainment system according to the second embodiment of the present invention. It is a cross-sectional view of a rear seat entertainment system according to the third embodiment of the present invention. It is a front view seen from the back seat of the rear seat entertainment system according to the third embodiment of the present invention.

Hereinafter, in order to explain this invention in greater detail, the embodiments of the present invention will be described with reference to the accompanying drawings.
The first embodiment.
Figure 1 is a perspective view of a rear seat entertainment system according to the first embodiment of the present invention, FIG. 2 is a sectional view, FIG. 3 shows the respective front view seen from the back seat.
1 to 3, reference numeral 1 is a RSE body, the liquid crystal is a display unit that displays an image (LCD: Liquid Crystal display Device) and the monitor 2, the sound and outputs the sound conduit speaker units 5 (5a, 5b ) and it has been implemented. Code 3 (3a, 3b), the sound tube type speaker unit 5 (5a, 5b) is an opening for transmitting to the rear seat passengers an output audio by a slit is formed. Reference numeral 10 denotes a vehicle interior ceiling lining has been applied, RSE body 1 is attached to the vehicle interior ceiling 10 via a bracket 30.

LCD monitor 2, the hinge 20 is openably configured axis RSE body 1 is set to the two-page spread state relative to the rear seat passengers by opening in use, housed in RSE body 1 in the closed when not in use has a structure that protects the LCD.
Sound guide tube speaker units 5 (5a, 5b) is a sound output from the speaker body opening 3 (3a, 3b) sound guide tube 4 (4a, 4b) for guiding up includes a opening and closing of the LCD monitor 2 It is implemented in the not out of the way location. Reference numeral 11 denotes a top plate of the vehicle, and the top plate 11, between the vehicle interior ceiling 10, usually space is provided.

Figure 4 is a block diagram showing an internal configuration of an electric system of the rear seat entertainment system according to the first embodiment of the present invention.
As shown in FIG. 4, RSE body 1 (control device), an audio input terminal 21, an analog / digital converter (A / D converter 22), a processing unit 23, a digital / analog converter ( D / a converter 24 and), and an output amplifier 25. Moreover, RSE body 1 includes a video input terminal 31, an A / D converter 32, a YUV (luminance and color difference signals) / RGB (primary color signals) converter 33, a menu display superimposing unit 34, an LCD controller 35 including. Furthermore, it configured to include also the system controller 41 to perform these sequence control.

In FIG. 4, block are labeled the same as FIGS. 1 to 3 are assumed to have the same name as that shown in FIGS. 1 to 3, the function.

Audio input terminal 21 outputs the analog audio signal outputted from the sound reproducing source (not shown) to the A / D converter 22. A / D converter 22, the input analog audio signal into digital audio signal and outputs to the arithmetic processing unit 23.
Processing unit 23, a volume control for the digital audio signal, balance of the left and right, performs correction processing of the sound quality by using the linear phase correction technique, and outputs it to the D / A converter 24.

D / A converter 24 outputs the digital audio signal outputted from the arithmetic processing unit 23 into an analog audio signal to the output amplifier 25. The output amplifier 25 is supplied to the sound conduit speaker unit 5 amplifies the signal level of the analog audio signal outputted from the D / A converter 24, and outputs it as speech.

Video input terminal 31 outputs an analog video signal from the playback source (not shown) to the A / D converter 32. A / D converter 32 converts the analog video signal inputted from the video input terminal 31 a (composite signal) into a digital YUV signal to the YUV / RGB converter 33.
YUV / RGB converter 33 outputs to the menu display superimposing unit 34 converts the digital YUV signal to a digital RGB signal. Menu display superimposing unit 34 outputs by superimposing a user operation menu on the LCD control unit 35 to the video signal output by the YUV / RGB converter 33. LCD control unit 35 controls the output timing and the like in order to display a video signal from the menu display superimposing unit 34 on the LCD monitor 2.
Incidentally, the system control unit 41, in order to control the RSE body 1, the above-mentioned A / D converter 22, the arithmetic processing unit 23, D / A converter 24, output amplifier 25, A / D converter 32, YUV / RGB converter 33 governs the sequence control of the menu display superimposing unit 34, LCD controller 35.

In the above configuration, for example, an analog video signal inputted DVD player or the like, from an external device is inputted from the video input terminal 31 to the RSE body 1.
Here input analog video signal is converted by the A / D converter 32 into video data in a digital YUV format. Then converted by YUV / RGB converter 33 to the video data of the digital RGB format and is output to the menu display superimposing unit 34. In the menu display superimposing unit 34, the video signal input from the external device superimposes the user operation menu as needed. Video signal the user operation menu is superimposed, the adjustments such as the output timing of the video signal is performed by the LCD controller 35 and displayed on the LCD monitor 2.

On the other hand, an analog audio signal inputted from an external device is inputted from the audio input terminal 21 to the RSE body 1. Input analog audio signal is converted by the A / D converter 22 into digital PCM (Pulse Code Modulation) format data, is input to the arithmetic processing unit 23.

The arithmetic processing unit 23, to the input digital PCM format of the audio signal, sound volume adjustment, implementing a linear phase correction process for correcting the left and right balance, and sound quality degradation.
Incidentally, when the arithmetic processing unit 23 to implement the linear phase correction process described above, prior sound by the impulse response in the conduit-type speaker unit 5 (5a, 5b) it is necessary to measure the acoustic properties of. Here the measurement results based on determining the filter coefficients of the inverse correction filter (digital filter) performs a convolution operation on the input speech signal using the inverse correction filter designed here, the sound guide tube speaker units 5 (5a, correcting the phase characteristic and the sound pressure frequency characteristic of 5b). Details of this linear phase technique is disclosed in detail in Patent Document 2 described above. The arithmetic processing unit 23 for inverse correction filter described above is incorporated shall be composed of DSP (Digital Signal Processor).

Audio signal on which signal processing has been performed by the above is converted into an analog audio signal by the D / A converter 24, after being amplified to the signal level at the output amplifier 25, the sound guide tube speaker units 5 (5a, 5b) to the output It is.
Incidentally, the system control unit 41 controls the overall RSE body 1, it is assumed that also controls the user interface.

Meanwhile, as shown in FIG. 2, RSE body 1 is attached via a bracket 30 to the vehicle interior ceiling 10. Also, the sound guide tube speaker units 5 (5a, 5b) are mounted inside RSE body 1.
Sound guide tube speaker units 5 (5a, 5b) audio signal output from the sound guide tube 4 (4a, 4b) via, through the slit of the opening 3 (3a, 3b), the occupant of the rear seat arriving. Sound guide tube 4 (4a, 4b) is mounted inclined towards the back seat, and to have a directivity of the sound to the rear seat.

Further, as shown in FIG. 3, the sound guide tube speaker units 5 (5a, 5b) of the left and right sides of the opening 3a, the width of 3b are constraints on the design of shortening the width of the RSE body 1, the sound guide tube type speaker units 5 (5a, 5b) is shorter than the diameter of the speaker body. Therefore, the left and right sound conduit 4a, 4b, the sound conduit speaker units 5 (5a, 5b) of the speaker main body from the opening 3a, reversed horn shape tapering toward the 3b, sound voice in this state conduit 4 (4a, 4b) will be confined in the.
Therefore, performs linear phase correction processing as disclosed in Patent Document 2 by the arithmetic processing unit 23, the sound guide tube 4 (4a, 4b) is corrected degradation of sound quality due to improved sound quality degradation due to limitations of the design .

According to the rear seat entertainment system according to the first embodiment described above, the slit-shaped opening 3 (3a, 3b) toward the listener sound guiding tube type speaker unit 5 (5a, 5b) having an opening and closing of the LCD monitor 2 mounted on unobtrusive located, RSE body 1 of the electric system (arithmetic processing unit 23), pre-measured sound conduit speaker units 5 (5a, 5b) inverse correction filter set based on the acoustic properties of the factors by correcting the phase characteristic and the sound pressure frequency characteristics of the sound guiding tube type speaker unit 5 (5a, 5b) by the filter coefficients, by applying the linear phase correction technique called, the RSE, structural sound quality the can be improved, including the poor performance of the sound guiding tube type speaker unit 5 to be used (5a, 5b).

According to the rear seat entertainment system according to the first embodiment described above, the RSE body 1, the sound guide tube speaker units 5 (5a, 5b) by a built-in, to be capable of viewing without using the wireless headphone made for, expensive headphones and unnecessary, it is possible to watch with no deterioration sound quality.
The opening 3 (3a, 3b) to be to the slit-shaped, without losing the compact sense of RSE, also allows sound quality correction by applying a linear phase technology.

The second embodiment.
Figure 5 is a sectional view of a rear seat entertainment system according to the second embodiment of the present invention, FIG. 6 is a front view seen from the back seat.
5, as shown in FIG. 6, the difference from the first embodiment shown in FIGS. 1-3, a structure for attaching the sound guiding tube type speaker unit 5 (5a, 5b) from the cabin ceiling 10, and, sound guide tube speaker units 5 (5a, 5b) located on the back of is in the structure to be covered by the cover frame 12 (12a, 12b). Other configurations are the same as in the first embodiment shown in FIGS. 1 to 3, also, the same is an electric system configuration.

When outputting the sound from the general speaker, sound output from the sound and the front side output from the back side of the speaker, for phase are opposite, cancel each other when the back side of the sound Komu around the front side, the original sound There will not be output. Sound guide tube speaker units 5 (5a, 5b) is also the same.
Therefore, in the second embodiment, as shown FIG. 5, FIG. 6, as the sound of the back side of the speaker does not interfere with the front side of the sound, with a cover frame 12 (12a, 12b), the sound guiding tube type speaker unit 5 (5a, 5b) has a structure for sealing the backside of the. At that time, it can be better to increase as much as possible the back of the space to play the bass.

Incidentally, the arithmetic processing unit 23 performs a linear phase correction processing, the sound guide tube speaker units 5 (5a, 5b) sound guide tube 4 (4a, 4b) together with correcting the sound quality deterioration due to, sound quality degradation due to limitations of the design improving the are the same as in the first embodiment.

According to the rear seat entertainment system according to the second embodiment described above, the sound guide tube speaker units 5 (5a, 5b) attached to the ceiling 10 top of the cabin, the sound guide tube speaker units 5 (5a, 5b) the back of the by a structure covered with a cover frame 12 (12a12b), enables bass reproduction, also, the sound conduit speaker units 5 (5a, 5b) is divided to go out from the RSE body 1, thinner RSE body 1 an effect such as can be.

In the first embodiment described above, as shown in FIG. 2, for implementing the sound guiding tube type speaker unit 5 (5a, 5b) to the inside of the RSE body 1 can not secure a large back space of the speaker, Therefore, it is disadvantageous to play bass, in the second embodiment described above, as shown in FIG. 5, the sound guide tube speaker units 5 (5a, 5b) to the top of the vehicle compartment ceiling 10 mounting the sound tube type speaker unit 5 (5a, 5b) rear covers cover frame 12 (12a, 12b) of between, by providing a space to the extent that a gap provided allows between the vehicle ceiling plate 11 , to enable the low-frequency sound reproduction that did not deny the feeling of sound shortage.
Moreover, by issuing the sound guiding tube type speaker unit 5 (5a, 5b) and on the RSE body 1, it is possible to reduce the thickness of the RSE body 1.

Embodiment 3.
Figure 7 is a cross-sectional view of a rear seat entertainment system according to the third embodiment of the present invention, FIG. 8 is a front view seen from the back seat.
7, as shown in FIG. 8, the difference between the second embodiment shown in Figures 5-6, the sound guide tube speaker units 5 (5a, 5b) and, with the vehicle interior ceiling 10 and the vehicle ceiling plate 11 It lies in the planar baffle structure using the space between. Others are the same as in the second embodiment.

In the above speaker mounting structure, remove the cover frame 12 described in Example 2 (12a, 12b), the space between the vehicle compartment ceiling 10 and the vehicle ceiling plate 11, the sound guide tube speaker units 5 (5a, 5b ) by using a back space, it is possible to secure a relatively large space, allowing the playback of the bass with powerful compared to the second embodiment described above.
The mounting in the passenger compartment ceiling 10 out sound conduit speaker units 5 (5a, 5b) from RSE body 1, also, the processing unit 23 performs a linear phase correction process, according to the sound guide tube 4 (4a, 4b) thereby correcting the degradation of sound quality, it is the same as in the second embodiment, the effect of improving the sound quality degradation due to limitations of the design is obtained.

According to the rear seat entertainment system according to the third embodiment described above, the sound guide tube speaker units 5 (5a, 5b) and, mounted on top of the vehicle compartment ceiling 10, between the cabin roof 10 and the vehicle ceiling plate 11 with planar baffle structure using the space, linear phase correction technique of course prevent sound quality deterioration, as compared with the second embodiment, further, it is possible to supplement the bass sound shortage.

Note that functions of the arithmetic processing unit 23 shown in FIG. 4, be implemented all in software, or at least a part thereof may be realized by hardware.
For example, the arithmetic processing section 23, pre-measured sound conduit speaker units 5 (5a, 5b) the sound guiding tube type speaker unit by an inverse correction filter filter coefficient based on the acoustic characteristics is set for 5 (5a, 5b) data processing for correcting the phase characteristic and the sound pressure frequency characteristics of the may be realized on a computer by one or more programs, also may be realized in that at least some hardware.

Rear seat entertainment system according to the present invention, by using a linear phase correction technique, since the sound quality degradation can be avoided without compromising the compact sense of RSE, for use in the system such as loudspeaker integral attached to the vehicle interior ceiling It is suitable for.

Claims (4)

  1. A display unit which is openably mounted to the shaft of the hinge,
    Implemented in unobtrusive positions opening and closing of the display unit, the sound guide tube type speaker unit having an opening towards the listener,
    Filter coefficients of the inverse correction filter based on the acoustic characteristics of the sound conduit type speaker unit which is measured in advance is set, operation of correcting the phase characteristic and the sound pressure frequency characteristic of the sound conduit speaker unit by the inverse correction filter a control unit including a processing unit,
    Rear seat entertainment system comprising the.
  2. Rear seat entertainment system of claim 1, wherein said opening is a slit shape.
  3. The sound conduit type speaker unit,
    Attached to the ceiling top of the passenger compartment, the rear seat entertainment system of claim 1, wherein the back of the sound conduit type speaker unit is characterized in that has a structure to be covered by the cover frame.
  4. The sound conduit type speaker unit,
    Cabin ceiling mounted thereon, the vehicle interior ceiling and rear seat entertainment system according to claim 1, characterized in that a planar baffle structure using the space between the vehicle ceiling plate.
PCT/JP2010/001787 2009-05-26 2010-03-12 Rear sheet entertainment system WO2010137218A1 (en)

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JP2009126613 2009-05-26

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US13/254,494 US20120045072A1 (en) 2009-05-26 2010-03-12 Rear seat entertainment system
JP2011515848A JPWO2010137218A1 (en) 2009-05-26 2010-03-12 Rear-seat entertainment system

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CN103198852A (en) * 2012-01-06 2013-07-10 现代摩比斯株式会社 Vehicle multimedia system and rear seat entertainment system of the vehicle multimedia system

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